(Cell Metabolism 38, 474–492.e1–e6; March 3, 2026) In the originally published version of this article, a statement describing the relationship between plasma non-esterified fatty acids (NEFAs) and 3-hydroxybutyrate (3OHB) was inconsistent with the data shown in Figures 4D and 4E. During revision, these figures were updated to display log-transformed data, but the corresponding text was not revised accordingly. This error has now been corrected online. This change does not affect the data or conclusions of the paper. The authors apologize for this error and any confusion this may have caused.